The OmniHTTPd Pro web server is susceptible to a DoS through a
lengthy POST request. If such a request is made to the server
which exceeds 4111 bytes in size the server process will die.
Neither the request or the crash are recorded in the server
logfiles.

(..)

Solution:

The vendor was initially notified on the 23rd of April, 2001. After
several attempts on our part to follow up on this, salesomnicron.ca
on May 2nd told us the matter was under investigation. Momentarily
no fix for the problem appears forthcoming.